PIEZOELECTRIC FILM SCANNER TRANSDUCER
Original Publication Date: 1992-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
Existing raster output scanners utilize a rotating, multi-faceted or polygon mirror to direct the laser beam for exposure of a xerographic surface. AS illustrated in the figure, it is commonly known to rotate polygon mirror 12 while directing a laser beam at the mirror, thereby causing the reflected laser beam to scan or sweep across xerographic surface 14. The present invention proposes to use a smaller, and less expensive KYNAR@ piezo film, or similar piezoelectrically responsive film, with a metallized reflecting surface to replace the rotating polygon. As further illustrated in the figure, film 16 may be utilized to produce a one-piece transducer suitable for reflecting the beam from laser 18, so as to scan the beam across surface 14. Movement of the piezo film would be caused by the application of an AC voltage thereto, resulting in movement of film 16 in the direction indicated by arrows 20, thereby sweeping the laser beam across the full width of surface 14. Moreover, because the flexion of the piezo film is in alignment with the plane of the laser beam, there would be no need for additional corrective optics. In addition, should a more reflective surface be required, it may be possible to affix a small mirror to the face of the film while still maintaining the scanning ability achieved with the piezoelectric transducer.